Drip - Better full-canvas effect; proper description

h/t Karl, code by Pere (w/ some clean-up by me)

Closes https://sourceforge.net/p/tuxpaint/bugs/256/

src/po/sd.po

@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2022-07-03 16:31-0700\n"
+"POT-Creation-Date: 2022-07-03 16:39-0700\n"
 "PO-Revision-Date: 2013-01-09 14:39+0530\n"
 "Last-Translator: Chandrakant Dhutadmal\n"
 "Language-Team: Sindhi-PA\n"
@@ -1404,12 +1404,18 @@ msgstr "ليڪن واري نقش ۾ تصوير بدلائڻ لاءِ ڪلڪ ڪر
 msgid "Click to turn the entire picture into a chalk drawing."
 msgstr "ليڪن واري نقش ۾ تصوير بدلائڻ لاءِ ڪلڪ ڪريو ۽ اين جي چوطرف مائوس هلايو "
 
-#: ../../magic/src/blocks_chalk_drip.c:174
+#: ../../magic/src/blocks_chalk_drip.c:176
 #, fuzzy
 #| msgid "Click and move the mouse around to make the picture drip."
 msgid "Click and drag the mouse around to make the picture drip."
 msgstr "تصوير بوند رچڻ لاءِ ڪلڪ ڪريو ۽ اُن جي چوطرف مائوس هلايو۔"
 
+#: ../../magic/src/blocks_chalk_drip.c:180
+#, fuzzy
+#| msgid "Click to sharpen the entire picture."
+msgid "Click to make the entire picture drip."
+msgstr "پنهنجي سموري تصوير تکي ڪرڻ لاءِ ڪلڪ ڪريو۔"
+
 #: ../../magic/src/blur.c:81
 msgid "Blur"
 msgstr "ڌنڌلو"